Java
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Java regular expression performance
I'm trying to parse links with regular expressions in Java But I think it's getting too slow For example, to extract a…… -
Java – find the smallest integer based on the input
I have a task to find the minimum, maximum and average number of user input Basically, they enter positive integers, s…… -
Java – ArrayList removeall() does not delete objects
I have simple ArrayLists for member classes: ArrayList<Member> mGroupMembers = new ArrayList<>(); ArrayLis…… -
Java – cannot run Hello world on drools – kiecontainer does not select DLR files from the classpath
The following documents: 6.1 The basics I created a simple class applicant, which should be checked by using the DRL f…… -
How to handle Boolean values in Java through bitwise operators
Consider this example int i=11,j=5; boolean b=true,c=false; System.out.println(b&c); // --> output=false System…… -
Java thread pool
I want to learn how to write a thread pool in Java Can anyone point out my useful resources? Solution You can view the…… -
Java Rest framewok
Which is a good java rest framework? I want it to be deployed with Tomcat 6 Solution See my answer: Restful web develo…… -
Java – many methods that cover many classes in one class
public class EventController extends MouseAdapter implements ActionListener { public class EventController extends Mou…… -
Java – find the size of the file in the gzip file
Is there any way to find out the size of the original file in the gzip file in Java? As in, I have a 15 MB file a.txt,…… -
Loop problem in Java
What is the error in the following code? while ((char t==(char) system.in.read())!='0') Solution You cannot declare a …… -
Java – use list Multiple use of size () or variable? (local optimization)
I have a simple function called many In this function, I have many call list sizes (including about 10 elements): list…… -
How to judge the efficiency of Java code
I just realized that from a computational point of view, I don't know how to judge whether a piece of Java code is val…… -
Java – what does “J” mean in a JApplet?
翻译错误 Invalid Access Limit Solution When sun started working on swing, they were like javax swing. Something like a…… -
Apply the function to each nth element in the vector
I have a vector in R: > v <- c(5,10,15,20,25,30,35,40,45,50) I want to apply a function to every Nth element of …… -
Java — on doubles and equality
I have a method that returns a double When I tested this method as part of JUnit, I noticed the following oddities: St…… -
Use AutoCAD Library in Java to read DWG file?
Are there any open source Java or JavaScript libraries available for parsing DWG file and get objects from it I want t…… -
Suspend and resume the main thread in C for windows
I need to be able to pause and resume the main thread in Windows C applications I used it handle = GetCurrentThread();…… -
How to ensure that collections in Java contain only one type?
I want to make sure that the collection can only hold one type It can be said that there is such a method public Colle…… -
Concurrency – can I receive results from one of multiple goroutines in go?
I just learned about Google's programming language go I'm interested in the concurrency support it provides and set ou…… -
Java – how to avoid code duplication of many small classes?
I have different courses, including English, Spanish, French, etc Class English{ String name = "English"; Stri…… -
AWT or swing for Java for GUI building?
I need to form a fairly simple GUI for the server monitoring process It will have tabs that can cause log tailing, res…… -
Is there any way to make the constructor return a = = null object in Java?
I have a feeling that the answer is "no", but I think I'll ask just in case Pseudo code: Foo foo = new Foo(); if(foo …… -
Java – hibernate or JPA?
When using spring 3.0, hibernate or JPA is recommended What are their advantages and disadvantages when used with spri…… -
Java – can I change the shape of JButton?
Can I change the shape of JButton from rectangle to circle? Solution I think this may be what you're looking for: http…… -
Storing DPI and paper size information in JPEG using java
I have the following code: ImageIO.write(originalImage,OUTPUT_TYPE,resultOutput); This is for the following javax imag…… -
Java – how to generate a unique ID on a web server cluster
In the following scenarios: 1 database 4 web servers How does the web server generate unique IDs for databases to make…… -
There are many if conditions in Java
I just started learning Java and have a very basic problem I have a label. I want to change the color when a random in…… -
How does the Java link list loop using the for loop?
Hello, I'm trying to create a for loop that iterates through the linked list For each data, it will be listed separate…… -
Global sum error of multithreading in Java
I'm new to multithreading in Java. I made some code to see how it works I use global = 0 as the global int variable an…… -
Java – is it possible to find out whether the value exists twice in ArrayList?
I have an integer ArrayList ArrayList <Integer> portList = new ArrayList(); I need to check whether I have enter…… -
Java – is an if else tree the best approach in the following situations?
What am I doing: I'm creating a simple calculator in Java that reads a string written in postfix notation (for example…… -
Java for loop problem
I'm making a java program to calculate Simpson's integral rules This is my code Note the second column of numbers in t……